The boundary effect – Niles Audio Pro770FX User Manual
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If your home theater system is capable of reproducing Dolby Surround EX
®
sound,
consider using a second pair of StageFront FX loudspeakers (on the side walls) for
an additional rear surround effect, as shown in
Figure 3. Ideally, the side loudspeakers
should be placed in-line with the listening position with the BIPOLE/DIPOLE controls set to
DIPOLE. For a more focused surround effect, set the BIPOLE/DIPOLE controls to BIPOLE.
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If you like listening to music in surround modes (which emulate concert hall
acoustics), consider using more than two surround loudspeakers to provide an
extraordinary effect. With StageFront FX loudspeakers, it is easy to add another pair
without affecting the decor of the room.
NOTE: FOR THIS APPLICATION, YOU WILL NEED TO USE A MORE POWERFUL AMPLIFIER THAN
THE ONE BUILT INTO A TYPICAL SURROUND-SOUND RECEIVER OR AMPLIFIER. NILES MAKES A
NUMBER OF SYSTEMS INTEGRATION AMPLIFIERS WITH PROPRIETARY FEATURES THAT MAKE
THEM UNIQUELY SUITED TO ENHANCE YOUR EXISTING SURROUND-SOUND SYSTEM. CONSULT
YOUR LOCAL NILES DEALER FOR MORE INFORMATION.
THE BOUNDARY EFFECT
Placing a loudspeaker in a corner can powerfully affect the way a listener perceives
bass response. Known as the boundary effect, placing loudspeakers close to a
wall/ceiling boundary or near a corner wall boundary will emphasize certain bass
frequencies, while canceling others. This effect can make the loudspeaker sound
excessively boomy and inaccurate to some listeners, while to others it just seems
like more bass sound.
As a good rule-of-thumb, if you like listening to your current pair of loudspeakers
with the bass turned up, you’ll enjoy corner placement. However, if you listen with
the tone controls at neutral, try keeping the loudspeakers at least 2 or 3 feet from
the boundaries of the room.
Left
Right
Left
Right
Figure 1. ProFX loudspeakers are
placed near back corner walls of a
home theater room.
Figure 2. ProFX loudspeakers are
placed near back corner walls of a home
theater room with an L-shaped sofa.